Which of the following can be hot-swappable?（）

单项选择题The user turns on the computer and hears a popping sound and detects a burning smell. Thesystem will not power on. Which of the following is the MOST likely problem?（）

A. Power supply has blown.
B. CPU fan is faulty.
C. Motherboard has overheated and shutdown.
D. UPS has been tripped.

单项选择题Hyperthreading technology:（）

A. only works on computer systems with multiple core CPUs.
B. enables a processor to work with two independent computer instructions at once.
C. enables two independent processors to work on the same task, simultaneously.
D. allows a computer program to work on multiple tasks simultaneously.

单项选择题Which of the following devices would MOST likely require a serial adapter to be installed on amodern PC?（）

A. External modem
B. TV tuner
C. Mouse
D. Keyboard

单项选择题Which of the following broadband types can provide the MOST available bandwidth?（）

A.DSL
B.Fiber
C.Satellite
D.Cable

单项选择题A user reports that their UPS is making a loud beeping sound. Which of the following would cause this problem?（）

A. The UPS is overcharged.
B. Incorrect wattage on the power supply.
C. The UPS battery is not charged.
D. The UPS is in power management mode.